𝔖 Bobbio Scriptorium
✦   LIBER   ✦

High pressure Brillouin scattering and energy dispersive X-ray diffraction study of (NH4)2ZnCl4

✍ Scribed by J.L. Burris; L. Tereshchenko; P. Kabos; H.D. Hochheimer; Y. Luspin; C.R. Evenson; P.K. Dorhout

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
186 KB
Volume
61
Category
Article
ISSN
0022-3697

No coin nor oath required. For personal study only.

✦ Synopsis

We have performed a high pressure Brillouin scattering and energy dispersive X-ray diffraction study on (NH 4 ) 2 ZnCl 4 in the temperature range from room temperature to 150ЊC. At ambient pressure three phase transitions occur in this temperature range. Of special interest are the phase transitions at 91ЊC and 133ЊC because an incommensurate phase has been detected in this temperature range. We compare the results of our high pressure Brillouin scattering study with the ones obtained from other studies of the elastic constants. Our results for the anomaly in C 33 observed at the commensurate-incommensurate transition at 133ЊC at ambient pressure contradict the results of the other Brillouin scattering studies but agree well with the results of an ultrasonic study. This result seems to indicate that critical fluctuations of the order parameter at the phase transition are reduced by pressure. Values of the calculated adiabatic bulk modulus, B S , and the experimentally determined isothermal bulk modulus, B T , for various materials of the A 2 BX 4 family, are compiled and discussed.

πŸ“œ SIMILAR VOLUMES

An Energy-Dispersive X-Ray Diffraction S
An Energy-Dispersive X-Ray Diffraction Study of Monoclinic Eu2O3 under Pressure
✍ G. Chen; J.R. Peterson; K.E. Brister πŸ“‚ Article πŸ“… 1994 πŸ› Elsevier Science 🌐 English βš– 148 KB

The phase behavior of monoclinic ( \(B\)-type) \(\mathrm{Eu}_{2} \mathrm{O}_{3}\) under pressure in a diamond anvil cell was studied at room temperature by energydispersive X-ray diffraction at the Cornell High Energy Synchrotron Source. The bulk modulus \(\left(B_{0}\right)\) of \(B\)-type \(\mathr

X-ray diffraction study of -Ca3(PO4)2 at
X-ray diffraction study of -Ca3(PO4)2 at high pressure
✍ Shuangmeng Zhai; Xiang Wu πŸ“‚ Article πŸ“… 2010 πŸ› Elsevier Science 🌐 English βš– 625 KB

The Ξ²-tricalcium phosphate phase, Ξ²-Ca 3 (PO 4 ) 2 , has been studied at high pressures up to 15.4 GPa and room temperature in a diamond-anvil cell using angle-dispersive X-ray diffraction. No evidence of a phase transformation was observed in the present pressure range at 300 K. By fitting the pres

High-Pressure Studies of Cs2CuCl4 and Cs
High-Pressure Studies of Cs2CuCl4 and Cs2CoCl4 by X-Ray Diffraction Methods
✍ Y. Xu; S. Carlson; K. SΓΆderberg; R. Norrestam πŸ“‚ Article πŸ“… 2000 πŸ› Elsevier Science 🌐 English βš– 197 KB

Single crystals of Cs 2 CuCl 4 and Cs 2 CoCl 4 have been investigated at high pressures by X-ray di4raction techniques, using a diamond anvil cell. Increasing the pressure to just below 40 kbar caused the crystallinity of Cs 2 CuCl 4 to deteriorate rapidly. This was accompanied by a color change fro